Discovery of a new Y dwarf: WISE J030449.03-270508.3

D. J. Pinfield, M. Gromadzki, S. K. Leggett, J. Gomes, N. Lodieu, R. Kurtev, A. C. Day-Jones, M. T. Ruiz, N. J. Cook, C. V. Morley, M. S. Marley, F. Marocco, R. L. Smart, H. R.A. Jones, P. W. Lucas, Y. Beletsky, V. D. Ivanov, B. Burningham, J. S. Jenkins, C. CardosoJ. Frith, J. R.A. Clarke, M. C. Gálvez-Ortiz, Z. Zhang

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


We present a new Y dwarf, WISE J030449.03-270508.3, confirmed from a candidate sample designed to pick out low-temperature objects from the Wide-field Infrared Survey Explorer (WISE) data base. The new object is typed Y0pec following a visual comparison with spectral standards, and lies at a likely distance of 10-17 pc. Its tangential velocity suggests thin disc membership, but it shows some spectral characteristics that suggest that it may be metal poor and/or older than previously identified Y0 dwarfs. Based on trends seen for warmer latetype T dwarfs, the Y-band flux peak morphology is indicative of sub-solar metallicity, and the enhanced red wing of the J-band flux peak offers evidence for high gravity and/or low metallicity (with associated model trends suggesting an age closer to ~ 10 Gyr and mass in the range 0.02-0.03 M1). This object may thus be extending the population parameter space of the known Y0 dwarfs.

Original languageEnglish (US)
Pages (from-to)1931-1939
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Oct 21 2014
Externally publishedYes


  • Brown dwarfs
  • Stars: Low-mass
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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